Artículo
Ab initio studies of the electronic structure of l-cysteine adsorbed on Ag(111)
Fecha de publicación:
05/2012
Editorial:
American Chemical Society
Revista:
Langmuir
ISSN:
0743-7463
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We have performed ab initio calculations for the adsorption of l-cysteine on Ag(111) using density functional theory. We have focused on two possible adsorbed species: the l-cysteine radical (•S-CH 2-CH-NH 2-COOH) adsorbed almost flat at a bridge site, slightly displaced toward an fcc location, and the zwitterionic radical Z-cysteine (•S-CH 2-CH-NH 3 +-COO -) adsorbed at a bridge site, shifted to a hcp site forming a (4 × 4) unit cell (θ = 0.06) and a (√3 × √3) R 30° unit cell (θ = 0.33), respectively. Special attention has been paid to the electronic structure of the system. The adsorbate-silver bond formation has been exhaustively investigated by analyzing the density of states projected onto the different atoms of the molecule, and by charge density difference calculations. A complicated interplay between sp and d states of silver in the formation of bonds between the adsorbates and the surface has been found. The role of the carboxyl group in the interaction with the surface has been also analyzed. © 2012 American Chemical Society.
Palabras clave:
Charge Density Difference
,
Density Functional Theory
,
L-Cysteine
,
Adsorption
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Identificadores
Colecciones
Articulos(INFIQC)
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Citación
Luque, Noelia Beatriz; Velez, Patricio; Pötting, K.; Santos, Elizabeth del Carmen; Ab initio studies of the electronic structure of l-cysteine adsorbed on Ag(111); American Chemical Society; Langmuir; 28; 21; 5-2012; 8084-8099
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